US3087253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange method and apparatus
Assignee: Fuller Co
•
Filing: 1959-07-07
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Granted: 1963-04-30
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Expires: 1979-07-07
Abstract
No abstract record available.
Inventors
- 👤 Otto J H Wulf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:05
CPC Classifications
F; F28; F28D; F28D13/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
THE METHOD OF COOLING PULVERULENT OR GRANULAR MATERIALS WHICH COMPRISES ESTABLISHING FIRST AND SECOND SEPARATED AERATED COLUMS OF MATERIAL, INTRODUCING MATERIAL INTO AN END PORTION OF THE FIRST COLUMN TO PASS THERETHROUGH, TRANSFERRING MATERIAL FROM THE END PORTION OF THE FIRST COLUMN REMOTE FROM THE MATERIAL-FEED END TO ONE END THEREOF OF THE SECOND COLUMN, CIRCULATING A HEATEXCHANGE MEDIUM IN INDIRECT HEAT EXCHANGE WITH THE MATERIAL IN THE AERATED COLUMNS TO WITHDRAW HEAT FROM THE
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US2761668A
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US2777760A
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US2841476A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |